Init

links.txt

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+https://pinout.xyz/ Full pinout for the rpi3
+https://components101.com/sites/default/files/component_datasheet/SG90%20Servo%20Motor%20Datasheet.pdf Datasheet for the servomotor used

motor.py

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+import RPi.GPIO as GPIO
+import time
+import os
+
+# ----------------------------
+# GPIO setup
+# ----------------------------
+GPIO.setmode(GPIO.BCM)
+
+# Servo pins
+SERVO1_PIN = 19
+SERVO2_PIN = 18
+
+# Buttons
+BUTTON1_FWD = 5   # Motor1 forward
+BUTTON1_BWD = 6   # Motor1 backward
+BUTTON2_FWD = 17   # Motor2 forward
+BUTTON2_BWD = 27  # Motor2 backward
+SHUTDOWN_BTN = 26 # Shutdown button
+
+# Setup buttons
+buttons = [BUTTON1_FWD, BUTTON1_BWD, BUTTON2_FWD, BUTTON2_BWD, SHUTDOWN_BTN]
+for button in buttons:
+    GPIO.setup(button, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
+
+# Setup servo pins
+GPIO.setup(SERVO1_PIN, GPIO.OUT)
+GPIO.setup(SERVO2_PIN, GPIO.OUT)
+
+# PWM setup for servo motors (50Hz typical for servos)
+servo1 = GPIO.PWM(SERVO1_PIN, 50)
+servo2 = GPIO.PWM(SERVO2_PIN, 50)
+servo1.start(0)
+servo2.start(0)
+
+# ----------------------------
+# Speed variable (0-100%)
+# ----------------------------
+speed = 50  # Default speed percentage
+
+# Function to convert speed to duty cycle for servo (1-2 ms pulse)
+def speed_to_duty(speed_percent):
+    # 1 ms = 5% duty, 2 ms = 10% duty at 50Hz
+    # Map speed 0-100% to 5-10% duty cycle
+    duty = 5 + (speed_percent / 100) * 5
+    return duty
+
+# ----------------------------
+# Main loop
+# ----------------------------
+try:
+    while True:
+        if GPIO.input(SHUTDOWN_BTN) == GPIO.HIGH:
+            print("Shutting down...")
+            os.system("sudo shutdown now")
+        
+        # Motor 1
+        if GPIO.input(BUTTON1_FWD) == GPIO.HIGH:
+            servo1.ChangeDutyCycle(speed_to_duty(speed))
+            print("Pressed.")
+        elif GPIO.input(BUTTON1_BWD) == GPIO.HIGH:
+            servo1.ChangeDutyCycle(speed_to_duty(100 - speed)) # backward
+            print("Pressed.")
+        else:
+            servo1.ChangeDutyCycle(0)  # stop
+        
+        # Motor 2
+        if GPIO.input(BUTTON2_FWD) == GPIO.HIGH:
+            servo2.ChangeDutyCycle(speed_to_duty(speed))
+            print("Pressed.")
+
+
+        elif GPIO.input(BUTTON2_BWD) == GPIO.HIGH:
+            servo2.ChangeDutyCycle(speed_to_duty(100 - speed)) # backward
+            print("Pressed.")
+
+
+        else:
+            servo2.ChangeDutyCycle(0)  # stop
+
+        time.sleep(0.05)
+
+except KeyboardInterrupt:
+    pass
+
+finally:
+    servo1.stop()
+    servo2.stop()
+    GPIO.cleanup()
+

print.py

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+import RPi.GPIO as GPIO
+import time
+
+# ----------------------------
+# Setup
+# ----------------------------
+GPIO.setmode(GPIO.BCM)      # Use BCM numbering
+PIN = 26                    # The pin you want to monitor (BCM26)
+
+# Setup pin as input with pull-up
+GPIO.setup(PIN, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
+
+print(f"Monitoring GPIO{PIN}. Press Ctrl+C to exit.")
+
+try:
+    while True:
+        if GPIO.input(PIN):   # Pin is HIGH (1)
+            print(f"GPIO{PIN} is HIGH")
+        else:                 # Pin is LOW (0)
+            print(f"GPIO{PIN} is LOW")
+        time.sleep(0.1)       # Check every 100 ms
+
+except KeyboardInterrupt:
+    print("Exiting...")
+
+finally:
+    GPIO.cleanup()
+